fwctl/bnxt_en: Create an aux device for fwctl

Create an additional auxiliary device to support fwctl.
The next patch will create bnxt_fwctl and bind to this
device.

Link: https://patch.msgid.link/r/20260314151605.932749-4-pavan.chebbi@broadcom.com
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: pavanchebbi

drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c

@@ -50,6 +50,8 @@ static bool bnxt_auxdev_is_active(struct bnxt *bp, int idx)
 
 static struct bnxt_aux_device bnxt_aux_devices[__BNXT_AUXDEV_MAX] = {{
 	.name		= "rdma",
+}, {
+	.name		= "fwctl",
 }};
 
 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
@@ -278,6 +280,11 @@ void bnxt_ulp_stop(struct bnxt *bp)
 		aux_priv = bp->aux_priv[i];
 		edev = bp->edev[i];
 		mutex_lock(&edev->en_dev_lock);
+		if (i == BNXT_AUXDEV_FWCTL) {
+			edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
+			mutex_unlock(&edev->en_dev_lock);
+			continue;
+		}
 		if (!bnxt_ulp_registered(edev) ||
 		    (edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) {
 			mutex_unlock(&edev->en_dev_lock);
@@ -316,7 +323,7 @@ void bnxt_ulp_start(struct bnxt *bp)
 		aux_priv = bp->aux_priv[i];
 		edev = bp->edev[i];
 		mutex_lock(&edev->en_dev_lock);
-		if (!bnxt_ulp_registered(edev) ||
+		if (i == BNXT_AUXDEV_FWCTL || !bnxt_ulp_registered(edev) ||
 		    !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) {
 			goto clear_flag_continue;
 		}
@@ -520,7 +527,8 @@ void bnxt_aux_devices_add(struct bnxt *bp)
 			aux_dev = &bp->aux_priv[idx]->aux_dev;
 			rc = auxiliary_device_add(aux_dev);
 			if (rc) {
-				netdev_warn(bp->dev, "Failed to add auxiliary device for ROCE\n");
+				netdev_warn(bp->dev, "Failed to add auxiliary device for auxdev type %d\n",
+					    idx);
 				auxiliary_device_uninit(aux_dev);
 				if (idx == BNXT_AUXDEV_RDMA)
 					bp->flags &= ~BNXT_FLAG_ROCE_CAP;

include/linux/bnxt/ulp.h

@@ -24,6 +24,7 @@ struct bnxt;
 
 enum bnxt_auxdev_type {
 	BNXT_AUXDEV_RDMA = 0,
+	BNXT_AUXDEV_FWCTL,
 	__BNXT_AUXDEV_MAX
 };